JP2021016879A - Method of manufacturing lamination structure - Google Patents

Abstract

To provide a method of manufacturing a lamination structure capable of joining a plurality of lamination bodies with high quality and high strength by preventing the occurrence of internal flaws in a joining part in connection of lamination bodies formed from laminated weld beads.SOLUTION: A method of manufacturing a lamination structure laminates a reference lamination body 43 having a shape of any one structure of plurality of structures by forming a weld bead B along a surface direction of a base 25. A partial structure 45 of a shape formed by retreating a shape of the other structure except the one structure from a joining end with the reference structure 43 is laminated by forming a weld bead B along the surface direction of the base 25. A joining part 49 is formed by filling a gap part where there is no weld bead B between the reference lamination body 43 and the partial lamination body 45 with the weld bead B for connecting the reference lamination body 43 and the partial lamination body 45.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for manufacturing a laminated structure.

In recent years, there has been an increasing need for modeling using a 3D printer as a means of production, and research and development are being promoted especially for the practical application of modeling using a metal material. In a 3D printer that forms a metal material, a laminated structure is produced by melting metal powder or metal wire using a heat source such as a laser, an electron beam, or an arc, and laminating the molten metal.

In such a molding technique, there is a technique in which a plurality of laminates obtained by repeatedly laminating welded beads obtained by melting and solidifying a filler metal are welded to each other via a welded joint to form an integral joint structure. For example, it is disclosed in Patent Document 1.
In this joining method, grooves are formed at the abutting positions of the laminated bodies, and weld beads are formed at the grooves to join the laminated bodies to each other.

JP-A-2018-183815

For example, as shown in FIG. 9, in the joint structure W in which a pair of structures (first structure 83, second structure 85) are joined in a T shape in a plan view on the base 81, the second structure One end portion 85a in the longitudinal direction of 85 is joined to the side surface central portion 83a of the first structure 83. When this bonded structure W is manufactured by a laminated molding method, the first structure 83 and the second structure 85 are each laminated with a plurality of welded beads B, as shown in FIG. It is composed of the second laminated body 95. In the joint portion 99 between the first laminated body 93 and the second laminated body 95, the bead end portion 95a of the second laminated body 95 is abutted against the bead side surface 93a of the first laminated body 93 and joined.

However, as shown in FIG. 11, the surface of each welding bead B is an irregular uneven surface, and the welding torch interferes with the existing welding bead, so that it cannot be arranged at a desired proper position. is there. Therefore, internal defects such as cavities G, which are unwelded portions, are likely to occur in the joint portion 99 between the bead side surface 93a and the bead end portion 95a, and the joint quality is deteriorated. Further, the joint strength between the first laminated body 93 and the second laminated body 95 is lowered due to the internal defect.

Therefore, the present invention is a laminated structure capable of joining a plurality of laminated bodies with high quality and high strength by preventing internal defects from occurring at the joint portion when connecting the laminated bodies in which the welded beads are laminated. It is an object of the present invention to provide a manufacturing method.

The present invention has the following configuration.
It is a method for manufacturing a laminated structure in which a bonded structure in which a plurality of structures are joined to each other is formed by laminating a welded bead obtained by melting and solidifying a filler metal on a base.
A step of forming a welding bead along the plane direction of the base and laminating a reference laminate having the shape of any one of the plurality of structures.
A partial laminate having a shape obtained by retracting the shape of the other structure excluding any one of the structures from the joint end with the reference laminate is formed with a welded bead along the surface direction of the base. The process of laminating and
A step of filling a gap between the reference laminate and the partial laminate without a welding bead with a welding bead connecting the reference laminate and the partial laminate to form a joint.
A method for manufacturing a laminated structure having.

According to the present invention, when the laminated bodies in which the welded beads are laminated are connected to each other, it is possible to prevent the occurrence of internal defects at the joint portion. As a result, it is possible to manufacture a laminated structure in which a plurality of laminated bodies are joined with high quality and high strength.

It is a schematic schematic block diagram of the manufacturing system of a laminated structure. It is an explanatory view of the process of forming a laminated structure, and is the perspective view which shows the appearance of forming a pair of laminated bodies separated from each other on a base. It is a process explanatory drawing which prepares the laminated structure, and is the perspective view which shows the state of joining a pair of laminated bodies. It is a top view which shows the structure of another laminated structure. It is a top view which shows typically the modified bead formation path which formed the gap part at the intersection. It is a top view which shows typically each bead formation path which provided the additional bead formation path in the gap part of the intersection shown in FIG. (A) to (F) are process explanatory views which show the process of forming a welding bead at the joint part of a frame piece and a reinforcing part. It is explanatory drawing which shows an example of the torch movement locus at the time of forming the welding bead of a joint part. It is a perspective view of the conventional joint structure. It is a perspective view which shows the laminated body in the case of laminating modeling of the bonded structure shown in FIG. 9 is an enlarged cross-sectional view of a joint portion between the first laminated body and the second laminated body of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, a laminated structure manufacturing system to which the method for manufacturing a laminated structure of the present invention is applied will be described.

FIG. 1 is a schematic schematic configuration diagram of a laminated structure manufacturing system 100.
The laminated structure manufacturing system 100 having this configuration includes a laminated modeling device 11 and a controller 15 that controls the laminated modeling device 11 in an integrated manner.

The laminated modeling device 11 includes a welding robot 19 having a torch 17 on the tip shaft, and a filler material supply unit 21 that supplies the filler metal M to the torch 17. The torch 17 holds the filler metal M in a state of protruding from the tip.

The controller 15 includes a CAD / CAM unit 31, an orbit calculation unit 33, a storage unit 35, and a control unit 37 to which these are connected.

The welding robot 19 is an articulated robot, and the torch 17 provided on the tip shaft is supported so that the filler metal M can be continuously supplied. The position and posture of the torch 17 can be arbitrarily set three-dimensionally within the range of the degree of freedom of the robot arm.

The torch 17 has a shield nozzle (not shown), and shield gas is supplied from the shield nozzle. The arc welding method used in this configuration may be either a consumable electrode type such as shielded metal arc welding or carbon dioxide arc welding, or a non-consumable electrode type such as TIG welding or plasma arc welding, and the laminated structure Wa to be produced may be used. It is appropriately selected according to the situation.

For example, in the case of the consumable electrode type, the contact tip is arranged inside the shield nozzle, and the filler metal M to which the melting current is supplied is held by the contact tip. The torch 17 generates an arc from the tip of the filler metal M in a shield gas atmosphere while holding the filler metal M. The filler metal M is fed from the filler metal supply unit 21 to the torch 17 by a feeding mechanism (not shown) attached to a robot arm or the like. Then, when the filler metal M that is continuously fed is melted and solidified while moving the torch 17, a linear welded bead B that is a molten solidified body of the filler metal M is formed on the base 25.

The CAD / CAM unit 31 creates shape data of the laminated structure Wa (target shape) to be manufactured, and then divides the laminated structure Wa (target shape) into a plurality of layers to generate layer shape data representing the shape of each layer. The trajectory calculation unit 33 obtains the movement trajectory of the torch 17 based on the generated layer shape data. The storage unit 35 stores data such as the generated layer shape data and the movement locus of the torch 17.

The controller 15 including the control unit 37 is a computer device including a CPU, a memory, an I / O interface, etc., and executes a drive program based on the layer shape data stored in the storage unit 35 and the movement locus of the torch 17. , Drives the welding robot 19. That is, the welding robot 19 moves the torch 17 while melting the filler metal M with an arc based on the movement locus of the torch 17 (bead forming path described later) generated by the trajectory calculation unit 33 in response to a command from the controller 15. To do.

As a result, a laminated structure Wa in which a plurality of welded beads B are laminated on the base 25 is formed. By the way, when the laminated structure Wa is a bonded body in which a plurality of laminated bodies are joined, there is a possibility that an unwelded portion may be generated at the joint portion between the laminated bodies. Therefore, in the method for manufacturing this laminated structure, the generation of unwelded portions is prevented by the procedure described below.

As a basic step of the method for manufacturing a laminated structure, a case where the first structure 83 and the second structure 85 shown in FIG. 9 are connected in a T shape in a plan view is manufactured by laminated molding. Let's take an example.
FIG. 2 is a process explanatory view for forming a laminated structure, and is a perspective view showing a state in which a pair of laminated bodies are formed on a base 25 so as to be separated from each other. FIG. 3 is a process explanatory view for producing a laminated structure, and is a perspective view showing a state in which a pair of laminated bodies are joined.

In order to produce the laminated structure, as shown in FIG. 2, the welded bead B is laminated on the base 25 according to the shape of the first structure 83 of the bonded structure W shown in FIG. A body (reference laminate) 43 is formed. Further, the welded bead B is laminated on the base 25 in a shape in which the shape of the first laminated body 43 (first structure 83) is retracted from the joint end with the first laminated body 43 in the bead forming direction. A laminated body (partial laminated body) 45 is formed. The forming direction of the welded bead B at this time is the direction along the surface direction of the base 25. It should be noted that either of the first laminated body 43 and the second laminated body 45 may be formed first.

As a result, the second laminated body 45 has a shape shortened in the bead forming direction (longitudinal direction of the second structure 85), and a gap in which a welding bead is not formed between the first laminated body 43 and the second laminated body 45. A portion 47 is provided.

Next, as shown in FIG. 3, the first laminated body 43 and the second laminated body 43 and the second laminated body 43 are formed in the gap portion 47 (see FIG. 2) in which the welding bead is not formed between the first laminated body 43 and the second laminated body 45. A welded bead B that connects to the laminated body 45 is formed. As a result, the joint portion 49 that fills the gap portion 47 is formed. The joint portion 49 is a laminated body in which a plurality of layers of welded beads B are laminated. Here, the forming direction of the welded bead B of the joint portion 49 is shown in the direction along the surface direction of the base 25, but it may be a direction intersecting the surface direction of the base 25. In that case, the forming direction of the welded bead B is preferably from the base 25 side toward the other side (upper side in FIG. 3) of the first laminated body 43 and the second laminated body 45 in the laminating direction. By making the forming direction of the welded bead B different between the joint portion 49 and the first laminated body 43 and the second laminated body 45, the bonding state between the first laminated body 43 and the second laminated body 45 becomes better. , Both joint strengths can be further improved.

It is preferable that the welding heat input when forming the joint portion 49 is larger than the welding heat input when forming the first laminated body 43 and the second laminated body 45. According to this, when the joint portion 49 is formed, the connecting portion between the first laminated body 43 and the second laminated body 45 is surely melted, and the first laminated body 43 and the second laminated body 45 are integrally connected. be able to. Further, since no unwelded portion is formed, the welded bead of the joint portion 49 is uniformly formed. Then, in the welded beads laminated on the joint portion 49, the welded bead of the front layer and the welded bead of the next layer are melted together at the joint surface and solidified. As a result, the bonding strength between the bead layers is increased, and the bonding strength between the first laminated body 43 and the second laminated body 45 is improved.

By the above steps, the first laminated body 43 and the second laminated body 45 are made to have high strength without forming an unwelded portion at the joint portion between the first structure 83 and the second structure 85 shown in FIG. Can be joined.

Next, another example of manufacturing the laminated structure by the above basic steps will be described.
FIG. 4 is a plan view showing the configuration of another laminated structure Wb.
The laminated structure Wb has a frame body 51 laminated and shaped on the base 25, and a plurality of reinforcing portions 53A, 53B, 53C, 53D connected to the frame body 51. The entire frame 51 is formed in a rectangular ring shape, and reinforcing portions 53A, 53B, 53C, and 53D are joined to the intermediate portions of the four sides of the frame 51.

The reinforcing portions 53A, 53B, 53C, and 53D are laminated so that the length from the outside of the frame body 51 toward the inside of the frame body 51 is longer than the thickness of the frame body 51 and is the same height as the frame body 51. Therefore, the frame body 51 is composed of four frame pieces 51A, 5B, 51C, 51D which are divided by the reinforcing portions 53A, 53B, 53C, 53D on each of the four sides and have an L shape in a plan view.

In the reinforcing portion 53A, a welding bead is formed along the P1 direction indicated by the arrow in FIG. Further, in the frame piece 51A, a welding bead is formed along the P2 direction orthogonal to the P1 direction. Similarly for the other reinforcing portions 53B, 53C, 53D, the forming direction of each welding bead is orthogonal to the forming direction of the welding beads of the frame pieces 51B, 51C, 51D. Although the example in which the P1 direction and the P2 direction are orthogonal to each other is shown here, the present invention is not limited to this, and each reinforcing portion may be provided so as to have an intersection angle other than the orthogonality.

Hereinafter, a step of manufacturing the laminated structure Wb having the above configuration in the same manner as the above-mentioned manufacturing method of the laminated structure Wa will be specifically described.
The three-dimensional shape data of the laminated structure Wb described above is input to the controller 15 of the laminated structure manufacturing system 100 shown in FIG. 1, and the three-dimensional shape data is stored in the storage unit 35.

The control unit 37 reads the three-dimensional shape data of the laminated structure Wb from the storage unit 35, divides the three-dimensional shape data in the stacking direction (vertical direction), and obtains slice data of a plurality of layers. The control unit 37 outputs slice data to the trajectory calculation unit 33.

The trajectory calculation unit 33 obtains a bead formation path for each of the input slice data of the plurality of layers. The bead formation path is information for arranging the welded beads so that the welded beads to be formed have a shape corresponding to the slice data (cross-sectional shape in each layer of the laminated structure Wb). This is information indicating the arrangement and formation order of bead models assuming the shape of each welded bead. The bead formation path is used as information for determining the movement locus of the torch 17 (FIG. 1). The bead forming path obtained here may have an overlapping portion in which the bead forming paths overlap each other with an emphasis on the continuity of bead forming.

That is, for the frame body 51 included in the slice data, circularly continuous bead forming paths are generated, and for the reinforcing portions 53A, 53B, 53C, and 53D, linear shapes intersecting the bead forming paths for the frame body 51, respectively. A bead formation path is generated.

Next, the trajectory calculation unit 33 extracts the intersections of the bead forming paths generated corresponding to the frame body 51 and the reinforcing units 53A, 53B, 53C, and 53D where the bead forming paths intersect with each other. Here, the intersections C1, C2, C3, and C4 shown in FIG. 4 are extracted.

Then, each bead forming path including the extracted intersections C1, C2, C3, and C4 is modified to form a bead at the intersections C1, C2, C3, and C4 so as to form a gap portion that does not form a welding bead. Change to a path.

FIG. 5 is a plan view schematically showing a modified bead forming path in which a gap portion 55 is formed at intersections C1, C2, C3, and C4.
Here, the bead forming paths 57A, 57B, 57C, 57D of the reinforcing portions 53A, 53B, 53C, 53D (see FIG. 4) are left as they are, and the bead forming paths of the frame body 51 having a long continuous bead forming length are divided. A gap 55 is provided between the reinforcing portion and the reinforcing portion. As a result, the bead forming path of the frame body 51 becomes the modified bead forming path 59A, 59B, 59C, 59D which is shorter in the bead forming direction than the frame pieces 51A, 5B, 51C, 51D (see FIG. 4).

Next, an additional bead forming path for forming a welding bead is generated in the gap portion 55 provided at the intersections C1, C2, C3, and C4.
FIG. 6 is a plan view schematically showing each bead forming path in which the additional bead forming path 61 is provided in the gap between the intersections C1, C2, C3, and C4 shown in FIG.

As shown in FIG. 6, at the intersection C1, between the bead forming path 57A corresponding to the reinforcing portion 53A (see FIG. 4) and the modified bead forming path 59A, and between the bead forming path 57A and the modified bead forming path. An additional bead forming path 61 is generated between the 59B and the 59B, respectively. Similarly, at the intersections C2, C3, and C4, an additional bead forming path 61 is generated in each of the gaps 55.

The above-mentioned bead forming paths 57A, 57B, 57C, 57D form welded beads to be the reinforcing portions 53A, 53B, 53C, 53D, and the modified bead forming paths 59A, 59B, 59C, 59D and the additional bead forming paths 61 form a frame. Welding beads forming pieces 51A, 5B, 51C, 51D are formed.
Then, by sequentially laminating the welded beads formed by the above-mentioned bead forming paths in the laminating direction, the frame body 51 and the reinforcing portions 53A, 53B, 53C, and 53D are laminated and formed.

FIGS. 7A to 7F are process explanatory views showing a procedure for forming a welded bead at a joint portion between the frame piece 51A and the reinforcing portion 53A.
First, as shown in FIG. 7A, a welded bead B1 (corresponding to the frame piece 51A shown in FIG. 4) is formed on the base 25 along the modified bead forming path 59A (see FIG. 6) and welded. Bead B
2 (corresponding to the reinforcing portion 53A shown in FIG. 4) is formed along the bead forming path 57A (see FIG. 6). A gap 55 is provided between the welded bead B1 and the welded bead B2.

Then, as shown in FIGS. 7B and 7C, the welded bead B1 and the welded bead B2 are sequentially laminated, and the laminated body (frame piece 51A) 65 and the laminated body (reinforcing portion) having a predetermined height are laminated. 53A) 67 is formed.

Next, as shown in FIG. 7D, the welded bead B3 is formed in the gap 55 between the first-layer welded bead B1 of the laminated body 65 and the first-layer welded bead B2 of the laminated body 67. Is formed along the additional bead forming path 61 (see FIG. 6).

Further, as shown in FIGS. 7 (E) and 7 (F), the welded bead B3 is formed in the gap 55 along the additional bead forming path 61 (see FIG. 6), and the welded bead B3 is formed into the laminated bodies 65 and 67. The joint portion 69 is formed by sequentially laminating up to the height of. As a result, a laminated structure Wb in which the laminated body 65 and the laminated body 67 are integrated by the joint portion 69 is obtained.

In FIG. 7, after forming three layers of the welded beads B1 and B2, the formation of the first layer of the welded beads B3 is started. The torch 17 of the welding robot 19 shown in FIG. 1 welds the gap 55. The number of layers at which the welding bead B3 starts to be formed can be appropriately changed as long as it can be arranged at the position. That is, if the total laminated height of the laminated structure Wb is within a range in which the torch 17 can be arranged at a desired welding position in a desired posture, the laminated bodies 65 and 67 are continuously extended to the total laminated height of the laminated structure Wb. Can be formed. On the other hand, when the torch 17 does not reach the desired welding position or the desired welding posture cannot be obtained during the lamination, the total lamination height of the laminated structure Wb is divided into a plurality of height ranges and divided. The formation of the laminated bodies 65 and 67 and the formation of the joint portion 69 may be repeated for each height range. As a result, the laminated bodies 65 and 67 formed by the welded beads having a predetermined number of layers and the joint portion 69 are repeatedly laminated to finally form the total laminated height of the laminated structure Wb.

Further, the forming direction of the welded bead B3 in the gap portion 55 may be a direction intersecting the surface direction of the base 25 (in FIG. 7, the vertical direction upward direction).

In the method for manufacturing a laminated structure in which a plurality of laminated bodies are joined as described above, a welding bead is provided in the gap portion separately from the step of providing a gap portion at the joint portion between the laminated bodies and forming the laminated body with a welding bead. The laminated bodies are joined to each other by providing a step of forming the above. According to this, it is possible to prevent the formation of an unwelded portion such as the formation of a cavity at the joint portion between the laminated bodies. Further, when forming the joint portion, it is not necessary to provide a groove for welding in advance in the laminate and perform groove welding, pretreatment can be unnecessary, and the formation of the welding bead is not complicated.

Although the above-mentioned welding bead has been described as being formed by a torch movement locus along a straight or curved welding line, it may be a torch movement locus accompanied by a weaving operation.
FIG. 8 is an explanatory view showing an example of the torch movement locus when forming the welded bead of the joint portion 69.

Weaving welding is performed by advancing the torch along the welding line L while moving the torch at a right angle to the welding line L parallel to the longitudinal direction of the stacking body 67 in the gap portion 55 between the laminated body 65 and the laminated body 67. I do. The direction of the welding line L can be appropriately set according to the thickness of the laminated bodies 65 and 67, the size of the gap 55, and the like, and can be set in any direction such as the longitudinal direction of the laminated body 65.

By forming the joint by weaving welding, the welded bead can be easily and uniformly formed to an arbitrary width. Further, when the joint portion is formed by a plurality of passes, the pass calculation at the time of generating the additional bead forming pass 61 described above can be simplified.

As described above, the present invention is not limited to the above-described embodiment, and can be modified or applied by those skilled in the art based on the combination of the configurations of the embodiments with each other, the description of the specification, and the well-known technique. This is also the subject of the present invention and is included in the scope for which protection is sought.

For example, the intersection of the bead forming paths in the above example is an example in which two bead forming paths intersect, but three or more bead forming paths may intersect. In that case, any one bead forming path may be left as it is, and a gap may be provided in the other bead forming path. Further, if necessary, gaps may be provided in all bead forming paths. Further, in the above example, the bead forming path of the frame body 51 is divided into a plurality of bead forming paths, but the bead forming path is made continuous in the circumferential direction according to the shape of the frame body 51, and the reinforcing portion is formed by a plurality of beads. It may be divided into formation paths.

As described above, the following matters are disclosed in this specification.
(1) A method for manufacturing a laminated structure in which a bonded structure in which a plurality of structures are joined to each other is formed by laminating a welded bead obtained by melting and solidifying a filler metal on a base.
A step of forming a welding bead along the plane direction of the base and laminating a reference laminate having the shape of any one of the plurality of structures.
A partial laminate having a shape obtained by retracting the shape of the other structure excluding any one of the structures from the joint end with the reference laminate is formed with a welded bead along the surface direction of the base. The process of laminating and
A step of filling a gap between the reference laminate and the partial laminate without a welding bead with a welding bead connecting the reference laminate and the partial laminate to form a joint.
A method for manufacturing a laminated structure having.
According to the method for manufacturing this laminated structure, a plurality of joint portions are laminated by laminating a reference laminate and a partial laminate arranged with a gap in the reference laminate, and then laminating a joint portion that fills the gap. It is possible to prevent an unwelded portion from being generated at the joint portion to which the laminated body is joined.

(2) The method for manufacturing a laminated structure according to (1), wherein the step of laminating the joint portion forms a welded bead in a direction intersecting the surface direction of the base.
According to this method for manufacturing a laminated structure, the laminated bodies can be joined to each other with high strength by forming the welded beads at the joint portion along the laminating direction of the welded beads forming the laminated body.

(3) The method for producing a laminated structure according to (1) or (2), wherein the welded bead in the gap is formed by weaving welding.
According to this method for producing a laminated structure, a welded bead can be easily and uniformly formed to an arbitrary width.

(4) Any one of (1) to (3) to make the welding heat input when forming the welding bead in the gap portion larger than the welding heat input when forming the reference laminate and the partial laminate. The method for manufacturing a laminated structure according to 1.
According to this method for manufacturing a laminated structure, when forming a welded bead in a gap, a part of the already formed laminated body or the welded bead of the front layer is melted to more reliably connect the laminated bodies to each other. Welded beads can be formed.

(5) The orbit calculation unit
A step of dividing the three-dimensional shape data of the bonded structure in the stacking direction into slice data of a plurality of layers, and
A step of obtaining a bead forming path for forming a welded bead in a shape corresponding to the slice data, and
The step of extracting the intersection where the bead forming paths intersect with each other and
A step of changing at least one of the bead forming paths including the extracted intersection to a modified bead forming path that forms the gap that does not form a welded bead at the intersection.
A step of generating an additional bead forming path for forming a welded bead in the gap, and
The method for manufacturing a laminated structure according to any one of (1) to (4).
According to the method for manufacturing this laminated structure, by changing at least one bead forming path including the intersection to a modified forming path in which the gap is formed, a plurality of laminated bodies are formed in the gap at the intersection. Is formed with. By forming a welded bead in this gap along the additional bead forming path, a bonded structure in which a plurality of laminated bodies are bonded can be obtained. Therefore, it is possible to prevent an unwelded portion from being generated in the welded bead at the intersection by changing only a part of the bead forming path at the intersection without changing the bead shape path of the entire joint structure.

(6) Of the plurality of bead forming paths included in the intersection, any one of the bead forming paths is left as it is, and the other bead forming paths are used as modified bead forming paths provided with the gaps. The method for manufacturing a laminated structure according to (5) to be changed.
According to the manufacturing method of this laminated structure, one bead forming path is used as it is at the intersection, and a gap is provided only in the other bead forming path, so that the bead forming path can be changed to the minimum necessary. ..

11 Laminated modeling device 15 Controller 17 Torch 19 Welding robot 21 Welding material supply unit 25 Base 31 CAD / CAM unit 33 Orbital calculation unit 35 Storage unit 37 Control unit 43 First laminated body (reference laminated body)
45 Second laminated body (partial laminated body)
47 Gap 49 Joint 51 Frame 51A, 51B, 51C, 51D Frame piece 53A, 53B, 53C, 53D Reinforcement 55 Gap 57A, 57B, 57C, 57D Bead formation path 59A, 59B, 59C, 59D Modified bead formation Pass 61 Additional bead forming pass 65, 67 Laminated body 69 Joint part 100 Laminated structure manufacturing system B, B1, B2, B3 Welded bead M Welding material Wa, Wb Laminated structure W Joint structure

Claims (6)

It is a method for manufacturing a laminated structure in which a bonded structure in which a plurality of structures are joined to each other is formed by laminating a welded bead obtained by melting and solidifying a filler metal on a base.
A step of forming a welding bead along the plane direction of the base and laminating a reference laminate having the shape of any one of the plurality of structures.
A partial laminate having a shape obtained by retracting the shape of the other structure excluding any one of the structures from the joint end with the reference laminate is formed with a welded bead along the surface direction of the base. The process of laminating and
A step of filling a gap between the reference laminate and the partial laminate without a welding bead with a welding bead connecting the reference laminate and the partial laminate to form a joint.
A method for manufacturing a laminated structure having. The method for manufacturing a laminated structure according to claim 1, wherein the step of laminating the joint portion is a step of forming a welded bead in a direction intersecting the surface direction of the base. The method for producing a laminated structure according to claim 1 or 2, wherein the welded bead in the gap is formed by weaving welding. The laminate according to any one of claims 1 to 3, wherein the welding heat input when forming a welded bead in the gap is larger than the welding heat input when forming the reference laminate and the partial laminate. How to manufacture the structure. The orbit calculation unit
A step of dividing the three-dimensional shape data of the bonded structure in the stacking direction into slice data of a plurality of layers, and
A step of obtaining a bead forming path for forming a welded bead in a shape corresponding to the slice data, and
The step of extracting the intersection where the bead forming paths intersect with each other and
A step of changing at least one of the bead forming paths including the extracted intersection to a modified bead forming path that forms the gap that does not form a welded bead at the intersection.
A step of generating an additional bead forming path for forming a welded bead in the gap, and
The method for manufacturing a laminated structure according to any one of claims 1 to 4. A claim in which one of the plurality of bead forming paths included in the intersection is left as it is, and the other bead forming paths are changed to modified bead forming paths provided with the gaps. Item 5. The method for manufacturing a laminated structure according to Item 5.

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